Date: Mon, 11 Jul 2011 20:22:54 +0400 From: Solar Designer <solar@...nwall.com> To: Ludwig Nussel <ludwig.nussel@...e.de> Cc: oss-security@...ts.openwall.com, Michael Matz <matz@...e.de>, Thorsten Kukuk <kukuk@...e.de>, Andreas Jaeger <aj@...e.de>, Zefram <zefram@...h.org> Subject: Re: CVE request: crypt_blowfish 8-bit character mishandling On Mon, Jul 11, 2011 at 04:39:08PM +0200, Ludwig Nussel wrote: > Solar Designer wrote: > >[...] > >Also, it brings up the question: why merely use $2a$ running the new > >code rather than fully emulate the bug even for newly set passwords, > >which would make all passwords work, even on other networked machines? > >Sure, that would be even nastier for security, so maybe you managed to > >strike a balance well. But nevertheless the question is there. One of > >your options results in full backwards compatibility at a security cost > >(for the local system), but the other somehow chooses to strike a > >balance between compatibility and security without achieving either of > >these fully (for a network of systems). > > > >Maybe you can afford to drop BLOWFISH_2y to avoid those inconsistencies? > >I imagine that people won't know to enable this option unless/until they > >have already run into an issue anyway (that is, someone is already > >unable to log in). At this point, they could likely upgrade the rest of > >their networked systems as well... or downgrade this one. ;-( > > I'm not sure I understand what you are suggesting. I am not exactly suggesting anything specific as I don't know your priorities, but I point out the inconsistency. My preference would be that you don't implement that BLOWFISH_2y option - always have new hashes generated as 2y, even though this means that networked systems need to be upgraded to new package versions in sync. > Keep using the buggy > algorithm for new passwords and keep storing them as 2a I'd be unhappy about that, but it's a valid option to provide if you want to minimize user annoyance, including for networked systems that are not upgraded in sync (but are manually configured for this...) > as long as BLOWFISH_2a2x is turned on? No, you'd need a separate option (or a tri-state option) such that there's a way for non-networked systems to gradually migrate to 2y hashes without annoying any users. Alexander
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